Ricoh D146 Service Manual page 1941

IP Fax Switch 0A - Not used (do not change the settings)
IP Fax Switch 0B - Not used (do not change the settings)
IP Fax Switch 0C - Not used (do not change the settings)
IP Fax Switch 0D - Not used (do not change the settings)
No.
SIP: IP-FAX port mode (UDP)
00: 3 port mode
0-1
01: 2 port mode
10: 1 port mode
SIP: IP-FAX port mode (TCP)
00: 3 port mode
2-3
01: 2 port mode
10: 1 port mode
4-7 Not used.
SM
IP Fax Switch 0E (SP No. 1-111-013)
Function Comments
Switch the port mode for IP-FAX (T38
transport: UDP) at SIP call control.
Switch the port mode for IP-FAX (T38
transport: TCP) at SIP call control.
Do not change these settings.
165 D163